/*
 * Copyright 2015 Pivotal Software, Inc..
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.joomtu.smarterlife.filter;

import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.security.web.csrf.CsrfToken;
import org.springframework.web.filter.OncePerRequestFilter;

/**
 *
 * @author huguobing
 */
public class CsrfCookieGeneratorFilter extends OncePerRequestFilter {

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        // Spring put the CSRF token in session attribute "_csrf"
        CsrfToken csrfToken = (CsrfToken) request.getAttribute("_csrf");

        // Send the cookie only if the token has changed
        String actualToken = request.getHeader("X-CSRF-TOKEN");
        if (actualToken == null || !actualToken.equals(csrfToken.getToken())) {
            // Session cookie that will be used by AngularJS
            String pCookieName = "CSRF-TOKEN";
            Cookie cookie = new Cookie(pCookieName, csrfToken.getToken());
            cookie.setMaxAge(-1);
            cookie.setHttpOnly(false);
            cookie.setPath("/");
            response.addCookie(cookie);
        }
        filterChain.doFilter(request, response);
    }

}
